The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

The first of three expected polar vortex systems is predicted to bring frigid temperatures. Here's what is expected in South ...

Thanks to the polar vortex, the first half of December will bring multiple waves of Arctic air to the U.S. Here's what to expect in Tennessee.

There are early signs that the northeastern United States may be in for several waves of below-average low temperatures this ...

Temperatures across Indiana are set to be even colder tonight, as temperatures plunge into single digits and at the zero mark ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

That cold air mass also will move eastward but Florida below the panhandle will largely remain unaffected.

Good afternoon and happy Thursday, readers! Temperatures are dropping here in Washington, D.C., with chances of snow tomorrow ...

Morning Weather Update 12/4/25 ...